p-Doped p-phenylenediamine-substituted fluorenes for organic electroluminescent devices

Zhi Qiang Gao*, Ping Fan Xia, Pik Kwan Lo, Bao Xiu Mi, Hoi Lam TAM, Ricky M S WONG, Kok Wai CHEAH, Chin H. Chen

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

15 Citations (Scopus)


Two novel p-phenylenediamine-substituted fluorenes have been designed and synthesized. Their applications as hole injection materials in organic electroluminescent devices were investigated. These materials show a high glass transition temperature and a good hole-transporting ability. It has been demonstrated that the 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (F4-TCNQ) doped p-phenylene-diamine-substituted fluorenes, in which F4-TCNQ acts as p-type dopant, are highly conducting with a good hole-transporting property. The organic light emitting devices (OLEDs) utilizing these F4-TCNQ-doped materials as a hole injection layer were fabricated and investigated. The pure Alq3-based OLED device shows a current efficiency of 5.2 cd/A at the current density of 20 mA/cm2 and the operation lifetime is 1500 h with driving voltage increasing only about 0.7 mV/h. The device performance and stability of this hole injection material meet the benchmarks for the commercial requirements for OLED materials.

Original languageEnglish
Pages (from-to)666-673
Number of pages8
JournalOrganic Electronics
Issue number4
Publication statusPublished - Jul 2009

Scopus Subject Areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

User-Defined Keywords

  • Fluorene
  • Hole injection material
  • Hole transporting materials
  • Organic electroluminescent devices
  • p-Phenylenediamine


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